Angled multi-support-arm model propeller hub boring device and method
By designing a multi-arm model propeller hub boring device with angles, and using components such as inclined pads and positioning pins to achieve stable clamping, the problems of unstable clamping and difficult boring are solved, thereby improving the processing quality and efficiency. It is suitable for machining the inner hole of model propeller hubs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA HELICOPTER RES & DEV INST
- Filing Date
- 2025-12-09
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional machining methods make it difficult to stably clamp the rotor hub of a multi-arm model with angles, resulting in poor chip removal during boring, high boring resistance, and easy tool vibration, which affects machining quality and efficiency.
Design a multi-arm model propeller hub boring device with angle, including support, adjustment, positioning and clamping mechanisms. The device achieves stable clamping and positioning of the model propeller hub through components such as inclined pads and positioning pins, and ensures machining stability in conjunction with the clamping mechanism.
It improves the machining quality and efficiency of the inner holes of each arm of the model propeller hub, avoids the vibration phenomenon, simplifies the operation, and is applicable to the boring machining of other multi-arm model propeller hubs with angles.
Smart Images
Figure CN121870489A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of machining technology, specifically relating to a high-precision boring device and method for the inner holes of each arm of a multi-arm model propeller hub with angles. Background Technology
[0002] The model rotor hub is a core component of helicopter rotor testing, and the machining accuracy of the inner holes of its various arms directly affects the stability of rotor test operation and the accuracy of test results. The model rotor hub described in this invention is made of 40CrNiMoiA (forging), with maximum dimensions of 203.5mm × 203.5mm × 90.8mm. The inner holes of each arm form a 2.5° angle with the bottom mounting surface, and the structure is as follows... Figure 1 As shown.
[0003] Traditional machining methods involve clamping the bottom mounting surface of the model propeller hub with a grid and then using CNC milling and boring to complete the machining of the inner holes of each arm. However, this machining method suffers from insufficient clamping stability, difficulty in chip removal, high boring resistance, and a tendency to vibrate the tool, which affects machining quality and efficiency. Furthermore, the model propeller hub described in this invention has each arm at an angle to its bottom mounting surface, making it impossible to complete the machining using the aforementioned traditional method.
[0004] Therefore, there is an urgent need to design a boring device for the rotor hub of a multi-arm model with angles. Summary of the Invention
[0005] Purpose of the invention: To address the issues of unstable clamping, difficulty in chip removal, and boring difficulties in machining the inner holes of multi-arm model propeller hubs with angles, this invention provides a boring device and method for multi-arm model propeller hubs with angles, thereby improving machining quality and efficiency.
[0006] To address the above-mentioned technical issues, the present invention provides the following technical solution: In a first aspect, the present invention provides a boring device for a multi-arm model propeller hub with angles, comprising: The support mechanism has an L-shaped plate that provides mounting positions for other components and is used for machine tool clamping. An adjustment mechanism has an inclined pad that is mounted on an L-shaped plate. The inclined angle of the inclined pad is consistent with the inclined angle of the model propeller hub arm, and is used to adjust one arm of the model propeller hub to a horizontal state. The positioning mechanism has a positioning bolt and a stepped positioning pin. The positioning bolt is vertically mounted on the L-shaped plate, the model paddle hub is inserted into the positioning bolt, and its rotation is restricted by the stepped positioning pin. The clamping mechanism has a clamping nut that cooperates with the positioning bolt to press the model propeller hub onto the inclined pad.
[0007] As a further technical solution of the present invention: the clamping mechanism further includes a pressure plate screw, a pressure plate and a support column. The support column is placed vertically on the L-shaped plate. One end of the pressure plate presses on the support column and the other end presses on the model paddle hub. The pressure plate screw is then tightened onto the L-shaped plate.
[0008] As a further technical solution of the present invention: the inclined pad is provided with 4 first positioning pin holes, which are used to be installed on the inner upper surface of the L-shaped plate by step positioning pins; The inclined pad is provided with a first bolt positioning hole for installing a positioning bolt; The inclined pad has a first inclined surface. During installation, the first inclined surface fits into the inner upper surface of the L-shaped plate without any visible gap, and is used to adjust one arm of the model paddle hub to a horizontal state.
[0009] As a further technical solution of the present invention: the L-shaped plate is provided with 4 second positioning pin holes for installing the inclined pad through the step positioning pin; The L-shaped plate is provided with a second bolt positioning hole for installing positioning bolts; The L-shaped plate is provided with a second inclined surface, which is perpendicular to the second positioning pin hole and the second bolt positioning hole; The L-shaped plate has two threaded holes, which are perpendicular to its inner upper surface, for installing pressure plate screws.
[0010] As a further technical solution of the present invention: the step positioning pin is used to position and install the inclined pad on the L-shaped plate, and is used for positioning when installing the model paddle hub.
[0011] As a further technical solution of the present invention: the positioning bolt is in transition fit with the first bolt positioning hole, the second bolt positioning hole and the central shaft hole of the model propeller hub, and is used to install and fix the model propeller hub by means of the lower washer, the upper washer and the tightening nut.
[0012] As a further technical solution of the present invention: the pressure plate is provided with a waist-shaped hole, which is used to press and fix the model propeller hub through the pressure plate screw, the support column and the threaded hole, so as to make the boring of the inner hole of each support arm of the model propeller hub more stable.
[0013] As a further technical solution of the present invention: the inclined pad is installed on the inner upper surface of the L-shaped plate through the first positioning pin hole, the second positioning pin hole and the stepped positioning pin, and its first inclined surface is in close contact with the inner upper surface of the L-shaped plate without visible gaps; the bottom mounting surface of the model propeller hub faces downwards and is positioned and installed on the upper surface of the inclined pad through the stepped positioning pin, and the L-shaped plate, the inclined pad and the model propeller hub are tightened and fixed by the positioning bolt, the lower washer, the upper washer and the tightening nut; the pressure plate screw is installed in the threaded hole on the L-shaped plate through the waist-shaped hole; the pressure plate is pressed and fixed to the model propeller hub by the pressure plate screw and the support column.
[0014] Secondly, the present invention provides a method for boring a propeller hub of a multi-arm model with an angle, which includes the following steps: Step 1: Position and install the inclined pad on the inner upper surface of the L-shaped plate using the step positioning pin, the first positioning pin hole, and the second positioning pin hole, ensuring a tight fit without visible gaps; Step 2: Position the model rotor hub with the bottom mounting surface facing down, and use the step positioning pins to position it on the upper surface of the inclined pad, ensuring a tight fit without any visible gaps; Step 3: Pass the positioning bolts through the lower washer, the second bolt positioning hole, the first bolt positioning hole and the central shaft hole of the model propeller hub in sequence, and then install and fix the model propeller hub through the upper washer and nut; Step 4: Press one end of the pressure plate against the support column and the other end against the model propeller hub, and tighten and fix it with the pressure plate screws to make the boring of the inner holes of each support arm of the model propeller hub more stable. Step 5: The lathe operator uses a four-jaw clamp to clamp the square ends of the L-shaped plate, aligns the center of the exposed right support arm, straightens the end face of the support arm, and bores the inner hole of the support arm as required. Step Six: Loosen the device, rotate the model propeller hub 90° in sequence, so that each arm is exposed to the right side in sequence, and repeat steps two, three, four, five, and six until the inner holes of all the arms of the model propeller hub are bored and machined.
[0015] In summary, the beneficial effects of the present invention are as follows: 1. The boring device and boring method described in this invention effectively solve the problems of unstable clamping, difficulty in chip removal, and difficulty in boring when machining the inner holes of each arm of a multi-arm model propeller hub with angle.
[0016] 2. This boring device facilitates chip removal and reduces boring resistance by boring the inner holes of each arm through a lathe, thus avoiding the phenomenon of tool vibration and effectively improving the machining quality and efficiency of the inner holes of each arm.
[0017] 3. The boring device has a simple structure and is easy to operate. It achieves reasonable and reliable positioning and clamping of parts, reduces the difficulty of operation for workers, and can be applied to boring the inner holes of various arms of other multi-arm model propeller hubs with angles.
[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the propeller hub structure of the present invention; Figure 2 This invention relates to a multi-arm model rotor hub boring device with angles. Figure 3 This is a schematic diagram of the mounting of the multi-arm model rotor hub boring device with angles according to the present invention; Figure 4 This is a schematic diagram of the inclined pad structure of the present invention; Figure 5 This is a schematic diagram of the L-shaped plate structure of the present invention; Figure 6 This is a schematic diagram of the stepped positioning pin structure of the present invention; Figure 7 This is a schematic diagram of the positioning bolt structure of the present invention; Figure 8 This is a schematic diagram of the lower washer structure of the present invention; Figure 9 This is a schematic diagram of the upper washer structure of the present invention; Figure 10 This is a schematic diagram of the tightening nut structure of the present invention; Figure 11 This is a schematic diagram of the pressure plate screw structure of the present invention; Figure 12 This is a schematic diagram of the pressure plate structure of the present invention; Figure 13 This is a schematic diagram of the support structure of the present invention. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.
[0021] In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention.
[0022] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0023] The following is in conjunction with the appendix Figure 1-13 The embodiments of the present invention will be described in detail below.
[0024] Example 1 This invention discloses a boring device for a multi-arm model propeller hub with angles, comprising: an inclined pad 1, an L-shaped plate 2, a stepped positioning pin 3, a positioning bolt 4, a lower washer 5, an upper washer 6, a tightening nut 7, a pressure plate screw 8, a pressure plate 9, and a support column 10. The inclined pad 1 is mounted on the inner upper surface 20 of the L-shaped plate 2 via a first positioning pin hole 12, a second positioning pin hole 16, and the stepped positioning pin 3, with its first inclined surface 14 fitting snugly against the inner upper surface 20 of the L-shaped plate 2 without visible gaps. The model propeller hub 11, with its bottom mounting surface facing downwards, is positioned and mounted on the upper surface 15 of the inclined pad 1 via the stepped positioning pin 3, and the L-shaped plate 2, the inclined pad 1, and the model propeller hub 11 are tightened and fixed by the positioning bolt 4, the lower washer 5, the upper washer 6, and the tightening nut 7. The pressure plate screw 8 is mounted in the threaded hole 19 on the L-shaped plate 2 via a waist-shaped hole 21. The pressure plate 9 is pressed and fixed to the model propeller hub 11 by the pressure plate screw 8 and the support column 10.
[0025] The inclined pad 1 is provided with four first positioning pin holes 12, which are used to be installed on the inner upper surface 20 of the L-shaped plate 2 by means of the step positioning pin 3; The inclined pad 1 is provided with a first bolt positioning hole 13 for installing positioning bolt 4; The inclined pad 1 has a first inclined surface 14. During installation, the first inclined surface 14 fits against the inner upper surface 20 of the L-shaped plate 2 without visible gaps, and is used to adjust one arm of the model paddle hub 11 to a horizontal state.
[0026] The L-shaped plate 2 is provided with four second positioning pin holes 16 for installing the inclined pad 1 through the step positioning pin 3; The L-shaped plate 2 is provided with a second bolt positioning hole 17 for installing positioning bolts 4; The L-shaped plate 2 is provided with a second inclined surface 18, which is perpendicular to the second positioning pin hole 16 and the second bolt positioning hole 17. The L-shaped plate 2 has two threaded holes 19, which are perpendicular to its inner upper surface 20, for installing pressure plate screws 8.
[0027] The step positioning pin 3 is used to position and install the inclined pad 1 on the L-shaped plate 2, and is also used for positioning when installing the model paddle hub 11.
[0028] The positioning bolt 4 is fitted with the first bolt positioning hole 13, the second bolt positioning hole 17, and the central shaft hole of the model propeller hub 11, and is used to install and fix the model propeller hub 11 through the lower washer 5, the upper washer 6, and the tightening nut 7.
[0029] The screw 8 is used to tighten and fix the pressure plate 9 and is installed in the threaded hole 19.
[0030] The pressure plate 9 is provided with a waist-shaped hole 21, which is used to press and fix the model propeller hub 11 through the pressure plate screw 8, the support column 10 and the threaded hole 19, so as to make the boring of the inner hole of each support arm of the model propeller hub 11 more stable.
[0031] The support column 10 is used to support the installation of the pressure plate 9.
[0032] Example 2 This invention discloses a method for boring a propeller hub in a multi-arm model with an angle, which includes the following steps: Step 1: Position and install the inclined pad on the inner upper surface of the L-shaped plate using the step positioning pin, the first positioning pin hole, and the second positioning pin hole, ensuring a tight fit without visible gaps; Step 2: Position the model rotor hub with the bottom mounting surface facing down, and use the step positioning pins to position it on the upper surface of the inclined pad, ensuring a tight fit without any visible gaps; Step 3: Pass the positioning bolts through the lower washer, the second bolt positioning hole, the first bolt positioning hole and the central shaft hole of the model propeller hub in sequence, and then install and fix the model propeller hub through the upper washer and nut; Step 4: Press one end of the pressure plate against the support column and the other end against the model propeller hub, and tighten and fix it with the pressure plate screws to make the boring of the inner holes of each support arm of the model propeller hub more stable. Step 5: The lathe operator uses a four-jaw clamp to clamp the square ends of the L-shaped plate, aligns the center of the exposed right support arm, straightens the end face of the support arm, and bores the inner hole of the support arm as required. Step Six: Loosen the device, rotate the model propeller hub 90° in sequence, so that each arm is exposed to the right side in sequence, and repeat steps two, three, four, five, and six until the inner holes of all the arms of the model propeller hub are bored and machined.
[0033] Thus, the objective of this invention has been achieved.
[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A device and method for boring a multi-arm model propeller hub with an angle, characterized in that, include: The support mechanism has an L-shaped plate that provides mounting positions for other components and is used for machine tool clamping. An adjustment mechanism has an inclined pad that is mounted on an L-shaped plate. The inclined angle of the inclined pad is consistent with the inclined angle of the model propeller hub arm, and is used to adjust one arm of the model propeller hub to a horizontal state. The positioning mechanism has a positioning bolt and a stepped positioning pin. The positioning bolt is vertically mounted on the L-shaped plate, the model paddle hub is inserted into the positioning bolt, and its rotation is restricted by the stepped positioning pin. The clamping mechanism has a clamping nut that cooperates with the positioning bolt to press the model propeller hub onto the inclined pad.
2. The multi-arm model propeller hub boring device with angle as described in claim 1, characterized in that, The clamping mechanism also includes a pressure plate screw, a pressure plate, and a support column. The support column is placed vertically on the L-shaped plate. One end of the pressure plate presses on the support column, and the other end presses on the model paddle hub. The pressure plate screw is then tightened onto the L-shaped plate.
3. The multi-arm model propeller hub boring device with angle as described in claim 2, characterized in that, The inclined pad is provided with 4 first positioning pin holes, which are used to install it on the inner upper surface of the L-shaped plate by means of stepped positioning pins; The inclined pad is provided with a first bolt positioning hole for installing a positioning bolt; The inclined pad has a first inclined surface. During installation, the first inclined surface fits into the inner upper surface of the L-shaped plate without any visible gap, and is used to adjust one arm of the model paddle hub to a horizontal state.
4. The multi-arm model propeller hub boring device with angle as described in claim 3, characterized in that, The L-shaped plate is provided with four second positioning pin holes for installing inclined pads through step positioning pins; The L-shaped plate is provided with a second bolt positioning hole for installing positioning bolts; The L-shaped plate is provided with a second inclined surface, which is perpendicular to the second positioning pin hole and the second bolt positioning hole; The L-shaped plate has two threaded holes, which are perpendicular to its inner upper surface, for installing pressure plate screws.
5. The multi-arm model propeller hub boring device with angle as described in claim 4, characterized in that, The step positioning pin is used to position and install the inclined pad on the L-shaped plate, and is also used for positioning during the installation of the model paddle hub.
6. The multi-arm model propeller hub boring device with angle as described in claim 5, characterized in that, The positioning bolts are transitionally fitted with the first bolt positioning hole, the second bolt positioning hole, and the central shaft hole of the model propeller hub, and are used to install and fix the model propeller hub by means of the lower washer, the upper washer, and the tightened nut.
7. The multi-arm model propeller hub boring device with angle as described in claim 6, characterized in that, The pressure plate is provided with a waist-shaped hole, which is used to press and fix the model propeller hub through the pressure plate screw, support and threaded hole, so as to make the boring of the inner hole of each support arm of the model propeller hub more stable.
8. The multi-arm model propeller hub boring device with angle as described in claim 7, characterized in that, The inclined pad is installed on the inner upper surface of the L-shaped plate through the first positioning pin hole, the second positioning pin hole, and the stepped positioning pin, and its first inclined surface fits in close contact with the inner upper surface of the L-shaped plate without any visible gaps; the bottom mounting surface of the model propeller hub faces downwards and is positioned and installed on the upper surface of the inclined pad through the stepped positioning pin, and the L-shaped plate, the inclined pad, and the model propeller hub are tightened and fixed by the positioning bolts, the lower washer, the upper washer, and the tightening nut; the pressure plate screw is installed in the threaded hole on the L-shaped plate through the waist-shaped hole; the pressure plate is pressed and fixed to the model propeller hub by the pressure plate screw and the support column.
9. The method for boring the hub of a multi-arm model with an angle as described in claim 1, characterized in that, Includes the following steps: Step 1: Position and install the inclined pad on the inner upper surface of the L-shaped plate using the step positioning pin, the first positioning pin hole, and the second positioning pin hole, ensuring a tight fit without visible gaps; Step 2: Position the model rotor hub with the bottom mounting surface facing down, and use the step positioning pins to position it on the upper surface of the inclined pad, ensuring a tight fit without any visible gaps; Step 3: Pass the positioning bolts through the lower washer, the second bolt positioning hole, the first bolt positioning hole and the central shaft hole of the model propeller hub in sequence, and then install and fix the model propeller hub through the upper washer and nut; Step 4: Press one end of the pressure plate against the support column and the other end against the model propeller hub, and tighten and fix it with the pressure plate screws to make the boring of the inner holes of each support arm of the model propeller hub more stable. Step 5: The lathe operator uses a four-jaw chuck to clamp the square ends of the L-shaped plate, aligns the center of the exposed right support arm, straightens the end face of the support arm, and bores the inner hole of the support arm as required. Step Six: Loosen the device, rotate the model propeller hub 90° in sequence, so that each arm is exposed to the right side in sequence, and repeat steps two, three, four, five, and six until the inner holes of all the arms of the model propeller hub are bored and machined.